Plumbing fitting



FIG. 1 is a perspective view of one side and a first end of the plumbing fitting;

FIG. 2 is an end view of the first end of the plumbing fitting; and,

FIG. 3 is a side view of the plumbing fitting in which the opposing side view, the top view, and the bottom view are identical to the side view shown.

The broken lines represent portions of the plumbing which do not form part of the claimed design. 

CLAIM The ornamental design for a plumbing fitting, as shown and described. 